Abstract: For the measurement of liquid level in sealed reagent tank, a simple level meter suitable for such applications is specifically designed according to the structural features of the reagent tank. As evidenced by its application at Huaibei Coal Preparation Plant, the meter is simple in structural design, convenient and reliable in operation, less in maintenance work, and high in measuring accuracy. Moreover, it occupies a small space, producing no adverse effect on the storage of liquid in tank.